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Synergy of turbulent and neoclassical transport through poloidal convective cells

朝比 祐一*; Grandgirard, V.*; Sarazin, Y.*; Donnel, P.*; Garbet, X.*; 井戸村 泰宏; Dif-Pradalier, G.*; Latu, G.*

Plasma Physics and Controlled Fusion, 61(6), p.065015_1 - 065015_15, 2019/05




相原 純; 本田 真樹*; 植田 祥平; 小河 浩晃; 大平 幸一*; 橘 幸男

日本原子力学会和文論文誌, 18(1), p.29 - 36, 2019/03



Implementation of a gyrokinetic collision operator with an implicit time integration scheme and its computational performance

前山 伸也*; 渡邉 智彦*; 井戸村 泰宏; 仲田 資季*; 沼波 政倫*

Computer Physics Communications, 235, p.9 - 15, 2019/02

 パーセンタイル:100(Computer Science, Interdisciplinary Applications)



Decreasing trend of ambient dose equivalent rates over a wide area in eastern Japan until 2016 evaluated by car-borne surveys using KURAMA systems

安藤 真樹; 三上 智; 津田 修一; 吉田 忠義; 松田 規宏; 斎藤 公明

Journal of Environmental Radioactivity, 192, p.385 - 398, 2018/12

 パーセンタイル:100(Environmental Sciences)



Recent progress on practical materials study by Bragg edge imaging at J-PARC

及川 健一; Su, Y.; 鬼柳 亮嗣; 川崎 卓郎; 篠原 武尚; 甲斐 哲也; 廣井 孝介; Harjo, S.; Parker, J. D.*; 松本 吉弘*; et al.

Physica B; Condensed Matter, 551, p.436 - 442, 2018/12

 パーセンタイル:100(Physics, Condensed Matter)

We are promoting for practical product observation by the energy-resolved neutron imaging method using high-intensity pulsed neutrons at J-PARC, under the Photon and Quantum Basic Research Coordinated Development Program from the Ministry of Education, Culture, Sports, Science and Technology, Japan. Bragg edge imaging, one of the energy-resolved neutron imaging methods for visualizing material properties, was applied to feasibility study of the temperature distribution of copper rod, complementary study of the texture and strain distribution of bent steel plates using neutron diffraction and EBSD, and so on. Outline of results obtained by these imaging experiments will be presented.


Study of the magnetization distribution in a grain-oriented magnetic steel using pulsed polarized neutron imaging

廣井 孝介; 篠原 武尚; 林田 洋寿*; Parker, J. D.*; Su, Y.; 及川 健一; 甲斐 哲也; 鬼柳 善明*

Physica B; Condensed Matter, 551, p.146 - 151, 2018/12

 パーセンタイル:100(Physics, Condensed Matter)

Grain oriented magnetic steel is widely used as a key material for magnetic industrial products. Since magnetic properties of steels are closely related to its magnetic domain structure, observation of the domain structure is important for understanding its magnetic properties. In this study, we attempted to observe the domain structure of a grain oriented steel using polarized pulsed neutron imaging. In the experiment, we first magnetized the sample by applying a magnetic field along the easy-to-magnetize direction via a coil, and confirmed the sample was magnetized almost uniformly from the obtained polarization distribution images. By analyzing the oscillatory behavior in the wavelength dependence of polarization, magnetization of the steel was estimated to be 1.82 T. Then, we removed the field and performed the same measurement. As a result, a striped domain structure was observed, with neighboring domains aligned anti-parallel to each other. From these results, it was demonstrated that our magnetic imaging method could visualize the magnetization and the direction of the domains in the practical steel.


Development of a polarization analysis method for visualization of the magnetic field distribution in a small electric transformer using pulsed polarized neutron imaging

廣井 孝介; 篠原 武尚; 林田 洋寿*; Parker, J. D.*; 及川 健一; Su, Y.; 甲斐 哲也; 鬼柳 善明*

JPS Conference Proceedings (Internet), 22, p.011030_1 - 011030_7, 2018/11

We have been developing magnetic imaging method for industrial products using polarized pulsed neutrons. In this presentation, we report observation results of magnetic field distribution in a small electric transformer as a demonstration of our magnetic imaging method. The polarized pulsed neutron imaging experiment was performed at BL22 RADEN at MLF of J-PARC. 9 polarization distribution images were obtained with changing incident polarization and analyzing direction in 3D. By analyzing wavelength dependent polarization position by position, distribution of field strength and direction around the core of the transformer were successfully visualized. Obtained field distribution images were well corresponded with that expected by the simulation and clearly demonstrated a leaked field from the gap of step lap.


Error estimation in observed acceleration data toward V&V of a seismic simulation

鈴木 喜雄; 飯垣 和彦

JAEA-Data/Code 2018-009, 41 Pages, 2018/09




Development of probabilistic risk assessment methodology against volcanic eruption for sodium-cooled fast reactors

山野 秀将; 西野 裕之; 栗坂 健一; 山元 孝広*

ASCE-ASME Journal of Risk and Uncertainty in Engineering Systems, Part B; Mechanical Engineering, 4(3), p.030902_1 - 030902_9, 2018/09



Measurement of MA reaction rates using spallation neutron source

大泉 昭人; 福島 昌宏; 辻本 和文; 山中 正朗*; 佐野 忠史*; Pyeon, C. H.*

KURRI Progress Report 2017, P. 50, 2018/08



Development of a probabilistic risk assessment methodology against a combination hazard of strong wind and rainfall for sodium-cooled fast reactors

山野 秀将; 西野 裕之; 栗坂 健一

Mechanical Engineering Journal (Internet), 5(4), p.18-00093_1 - 18-00093_19, 2018/08



Development of seismic countermeasures against cliff edges for enhancement of comprehensive safety of nuclear power plants; Cliff edges relevant to NPP building system

西田 明美; 崔 炳賢; 山野 秀将; 高田 毅士*

Proceedings of 2018 ASME Pressure Vessels and Piping Conference (PVP 2018), 11 Pages, 2018/07



Design study of beam window for accelerator-driven system with subcriticality adjustment rod

菅原 隆徳; 江口 悠太; 大林 寛生; 岩元 大樹; 松田 洋樹; 辻本 和文

Proceedings of 26th International Conference on Nuclear Engineering (ICONE-26) (Internet), 10 Pages, 2018/07



Neoclassical transport benchmark of global full-f gyrokinetic simulation in stellarator configurations

松岡 清吉; 井戸村 泰宏; 佐竹 真介*

Physics of Plasmas, 25(2), p.022510_1 - 022510_10, 2018/02

 被引用回数:1 パーセンタイル:100(Physics, Fluids & Plasmas)



Resonance analysis of cross section data measured by J-PARC/MLF using the modified REFIT code

水山 一仁; 岩本 信之; 岩本 修; 寺田 和司; 中尾 太郎

JAEA-Conf 2017-001, p.163 - 168, 2018/01

In the project entitled as "Research and development for Accuracy Improvement of neutron nuclear data on Minor ACtinides (AIMAC)", the cross section data of MAs ($$^{241,243}$$Am, $$^{237}$$Np) have been measured at neutron time-of-flight (TOF) beam line ANNRI installed at J-PARC/MLF. The high precision data is expected even in the case of small amount sample because the reaction rates are strongly increased by the high intensity pulsed neutron beam of J-PARC/MLF. We are going to analyze those cross section data by using the least-squares multilevel R-matrix code REFIT. For precise analysis of the cross section data measured by ANNRI, it is necessary to take into account the energy resolution function. In this study, we therefore adopt the modified version of REFIT which treats the energy resolution function for ANNRI. The precise energy calibration is also important. We performed the resonance analysis of the neutron total and capture cross section data of $$^{197}$$Au measured by ANNRI under the same operational condition of J-PARC/MLF to fix parameters related to energy calibration.


Study of fission using multi-nucleon transfer reactions

西尾 勝久; 廣瀬 健太郎; L$'e$guillon, R.*; 牧井 宏之; Orlandi, R.; 塚田 和明; Smallcombe, J.*; 千葉 敏*; 有友 嘉浩*; 田中 翔也*; et al.

Proceedings of 6th International Conference on Fission and Properties of Neutron-rich Nuclei (ICFN-6), p.590 - 597, 2017/11

We are promoting a fission study using multi-nucleon transfer reactions, where excited states in neutron-rich actinide nuclei, which cannot be accessed by particle capture and/or fusion reactions, are populated. This allows us to study fission in the new region of chart of nuclei. Also, the excited states in the fissioning nucleus are widely populated in the reactions, thus the effects of excitation energy on fission can be investigated. Experiments were carried out at the JAEA tandem facility in Tokai, Japan. We studied reactions using the $$^{18}$$O beam ($$sim$$9MeV/u) and several actinide target nuclei such as $$^{232}$$Th, $$^{238}$$U, $$^{237}$$Np, $$^{248}$$Cm. Ejectile nuclei and thus the transfer channels were identified by a newly developed silicon $$Delta$$E-E detectors. The produced nuclei in one experiment reached more than fifteen. Fission fragment mass distributions (FFMDs) were measured for each isotopes. Measured FFMDs are reproduced by a calculation based on the fluctuation-dissipation model (Langevin-type calculation), where effects of multi-chance fission were included. We also started to measure the prompt neutrons accompanied by fission.


Application of a communication-avoiding generalized minimal residual method to a gyrokinetic five dimensional Eulerian code on many core platforms

井戸村 泰宏; 伊奈 拓也*; 真弓 明恵; 山田 進; 松本 和也*; 朝比 祐一*; 今村 俊幸*

Proceedings of 8th Workshop on Latest Advances in Scalable Algorithms for Large-Scale Systems (ScalA 2017), p.7_1 - 7_8, 2017/11

ジャイロ運動論的5次元オイラーコードGT5Dに省通信一般化最小残差(CA-GMRES)法を適用し、一般化共役残差(GCR)法を用いたオリジナルコードとの性能比較をJAEA ICEX(Haswell)、Plasma Simulator(FX100)、Oakforest-PACS(KNL)において実施した。CA-GMRES法はGCR法に比べて約3.8倍の演算密度となることから、メモリとネットワークの帯域が制限された将来のエクサスケールアーキテクチャに適合する。性能評価の結果、GCR法に比べて計算カーネルは1.47$$sim$$2.39倍加速され、1,280ノード処理におけるデータ縮約通信は全体コストの5$$sim$$13%から約1%に削減された。


Benchmarking of flux-driven full-F gyrokinetic simulations

朝比 祐一*; Grandgirard, V.*; 井戸村 泰宏; Garbet, X.*; Latu, G.*; Sarazin, Y.*; Dif-Pradalier, G.*; Donnel, P.*; Ehrlacher, C.*

Physics of Plasmas, 24(10), p.102515_1 - 102515_17, 2017/10

 パーセンタイル:100(Physics, Fluids & Plasmas)



Global kinetic simulations of neoclassical toroidal viscosity in low-collisional perturbed tokamak plasmas

松岡 清吉; 井戸村 泰宏; 佐竹 真介*

Physics of Plasmas, 24(10), p.102522_1 - 102522_9, 2017/10

 被引用回数:1 パーセンタイル:77.96(Physics, Fluids & Plasmas)



Technical developments for accurate determination of amount of samples used for TOF measurements

寺田 和司; 中尾 太郎; 中村 詔司; 木村 敦; 岩本 修; 原田 秀郎; 高宮 幸一*; 堀 順一*

EPJ Web of Conferences (Internet), 146, p.03019_1 - 03019_4, 2017/09

 被引用回数:1 パーセンタイル:12.24


1934 件中 1件目~20件目を表示